Alcatel-Lucent 7750 Quality Of Service Manual

Alcatel-Lucent

7450 ETHERNET SERVICE SWITCH

7750 SERVICE ROUTER

7950 EXTENSIBLE ROUTING SYSTEM

QUALITY OF SERVICE GUIDE

RELEASE 14.0.R1

QUALITY OF SERVICE GUIDE RELEASE 14.0.R1

Alcatel-Lucent Proprietary

This document contains proprietary information of Alcatel-Lucent and is not to be disclosed or used except in

accordance with applicable agreements.

Alcatel-Lucent assumes no responsibility for the accuracy of the information presented, which is subject to change

without notice.

Alcatel, Lucent, Alcatel-Lucent and the Alcatel-Lucent logo are trademarks of Alcatel-Lucent. All other trademarks

are the property of their respective owners.

Disclaimers

Alcatel-Lucent products are intended for commercial uses. Without the appropriate network design engineering,

they must not be sold, licensed or otherwise distributed for use in any hazardous environments requiring fail-safe

performance, such as in the operation of nuclear facilities, aircraft navigation or communication systems, air traffic

control, direct life-support machines, or weapons systems, in which the failure of products could lead directly to

death, personal injury, or severe physical or environmental damage. The customer hereby agrees that the use, sale,

license or other distribution of the products for any such application without the prior written consent of Alcatel-

Lucent, shall be at the customer's sole risk. The customer hereby agrees to defend and hold Alcatel-Lucent harmless

from any claims for loss, cost, damage, expense or liability that may arise out of or in connection with the use, sale,

license or other distribution of the products in such applications.

This document may contain information regarding the use and installation of non-Alcatel-Lucent products. Please

note that this information is provided as a courtesy to assist you. While Alcatel-Lucent tries to ensure that this

information accurately reflects information provided by the supplier, please refer to the materials provided with any

non-Alcatel-Lucent product and contact the supplier for confirmation. Alcatel-Lucent assumes no responsibility or

liability for incorrect or incomplete information provided about non-Alcatel-Lucent products.

However, this does not constitute a representation or warranty. The warranties provided for Alcatel-Lucent products,

if any, are set forth in contractual documentation entered into by Alcatel-Lucent and its customers.

This document was originally written in English. If there is any conflict or inconsistency between the English

version and any other version of a document, the English version shall prevail.

Quality of Service Guide 3

Table of Contents

Getting Started...................................................................................................................................... 15

About This Guide................................................................................................................................................15

Alcatel-Lucent SR-Series Router Services Configuration Process ....................................................................15

QoS Policies ......................................................................................................................................... 17

In This Chapter ...................................................................................................................................................17

QoS Overview ....................................................................................................................................................17

Forwarding Classes.......................................................................................................................................18

High Priority Classes................................................................................................................................19

Assured Classes ......................................................................................................................................20

Best-Effort Classes ..................................................................................................................................20

Queue Parameters .............................................................................................................................................21

Queue ID ......................................................................................................................................................21

Unicast or Multipoint Queue ..........................................................................................................................21

Queue Hardware Scheduler..........................................................................................................................22

Committed Information Rate ........................................................................................................................22

Peak Information Rate...................................................................................................................................23

Adaptation Rule.............................................................................................................................................24

Committed Burst Size ...................................................................................................................................25

Maximum Burst Size .....................................................................................................................................26

High Priority Only Buffers ..............................................................................................................................26

Hi-Low Priority Only Buffers ..........................................................................................................................27

WRED Per Queue .........................................................................................................................................27

Native Queue Mode .................................................................................................................................28

Pool per Queue Mode ..............................................................................................................................31

Packet Markings............................................................................................................................................34

Queue Counters ............................................................................................................................................35

Queue-Types.................................................................................................................................................36

Color Aware Profiling.....................................................................................................................................36

QoS Policies .......................................................................................................................................................37

Service versus Network QoS ........................................................................................................................40

QoS Policy Entities........................................................................................................................................41

Network QoS Policies....................................................................................................................................42

Network Queue QoS Policies ........................................................................................................................44

Service Ingress QoS Policies ........................................................................................................................47

FC Mapping Based on EXP Bits at VLL/VPLS SAP ................................................................................50

Egress Forwarding Class Override ..........................................................................................................53

Service Egress QoS Policies.........................................................................................................................54

Named Pool Policies .....................................................................................................................................56

Slope Policies................................................................................................................................................58

RED Slopes..............................................................................................................................................59

Tuning the Shared Buffer Utilization Calculation......................................................................................62

Slope Policy Parameters..........................................................................................................................64

Scheduler Policies.........................................................................................................................................65

Virtual Hierarchical Scheduling ................................................................................................................67

Tiers .........................................................................................................................................................68

Table of Contents

4 Quality of Service Guide

Scheduler Policies Applied to Applications ..............................................................................................71

Scheduler Policies Applied to SAPs.........................................................................................................73

Customer Service Level Agreement (SLA) ..............................................................................................74

Scheduler Policies Applied to Multi-Service Sites ...................................................................................74

Shared Queues .............................................................................................................................................74

ATM Traffic Descriptor Profiles .....................................................................................................................75

Configuration Notes.......................................................................................................................................75

Network QoS Policies .......................................................................................................................... 77

In This Section....................................................................................................................................................77

Overview.............................................................................................................................................................77

Network Ingress Tunnel QoS Override .........................................................................................................78

For Tunnel Terminated IP Routing Decisions ..........................................................................................78

QoS for Self-Generated (CPU) Traffic on Network Interfaces..................................................................81

Basic Configurations...........................................................................................................................................84

Create a Network QoS Policy........................................................................................................................84

Applying Network Policies .............................................................................................................................86

Default Network Policy Values ......................................................................................................................87

Service Management Tasks ...............................................................................................................................91

Deleting QoS Policies....................................................................................................................................91

Remove a Policy from the QoS Configuration...............................................................................................92

Copying and Overwriting Network Policies ...................................................................................................93

Editing QoS Policies......................................................................................................................................94

Network QoS Policy Command Reference ........................................................................................................95

Command Hierarchies...................................................................................................................................95

Configuration Commands ........................................................................................................................95

Self-Generated Traffic Commands ..........................................................................................................97

Operational Commands ...........................................................................................................................98

Show Commands.....................................................................................................................................98

Command Descriptions .................................................................................................................................99

Configuration Commands ........................................................................................................................99

Operational Commands ...........................................................................................................................99

Show Commands...................................................................................................................................133

Network Queue QoS Policies ............................................................................................................ 147

In This Section..................................................................................................................................................147

Overview...........................................................................................................................................................147

Network Queue Parent Scheduler...............................................................................................................148

Basic Configurations.........................................................................................................................................148

Create a Network Queue QoS Policy..........................................................................................................148

Applying Network Queue Policies ...............................................................................................................151

XMAs and MDAs....................................................................................................................................151

Ethernet Ports ........................................................................................................................................152

SONET/SDH Ports .................................................................................................................................153

Default Network Queue Policy Values .............................................................................................................153

Service Management Tasks .............................................................................................................................158

Deleting QoS Policies..................................................................................................................................159

Remove a Policy from the QoS Configuration.............................................................................................159

Copying and Overwriting QoS Policies .......................................................................................................159

Table of Contents

Quality of Service Guide 5

Editing QoS Policies....................................................................................................................................160

Network Queue QoS Policy Command Reference...........................................................................................161

Command Hierarchies.................................................................................................................................161

Configuration Commands ......................................................................................................................161

Operational Commands .........................................................................................................................162

Show Commands...................................................................................................................................162

Command Descriptions ...............................................................................................................................162

Configuration Commands ......................................................................................................................162

Operational Commands .........................................................................................................................163

Show Commands...................................................................................................................................185

Service Egress and Ingress QoS Policies........................................................................................ 189

In This Section..................................................................................................................................................189

Overview...........................................................................................................................................................190

Basic Configurations.........................................................................................................................................190

Service Egress QoS Policy...............................................................................................................................191

Service Egress QoS Queue ........................................................................................................................192

Percent-Rate Support..................................................................................................................................192

Dynamic MBS for Egress Queue Group Queues........................................................................................193

Queue Length as a Delay Value ............................................................................................................195

Egress SAP Forwarding Class and Forwarding Profile Overrides ..............................................................196

Egress Criteria Classification Directly to Policer .........................................................................................197

Dot1p Egress Remarking ............................................................................................................................199

DEI Egress Remarking...........................................................................................................................200

DSCP/Prec Egress Remarking ...................................................................................................................204

Queue Depth Monitoring .............................................................................................................................205

Service Ingress QoS Policy ..............................................................................................................................207

Service Ingress QoS Queue........................................................................................................................208

Percent-Rate Support..................................................................................................................................209

Service Ingress Forwarding Class (FC) .....................................................................................................210

Service Ingress IP Match Criteria ................................................................................................................211

Service Ingress IPv6 Match Criteria ............................................................................................................212

Service Ingress MAC Match Criteria ...........................................................................................................212

VLAN ID Matching..................................................................................................................................213

Ingress Criteria Classification Directly to Policer .........................................................................................214

Virtual Network Identifier (VNI) Classification..............................................................................................215

FC Mapping Based on EXP Bits .................................................................................................................216

Service Management Tasks .............................................................................................................................217

Applying Service Ingress and Egress Policies ...........................................................................................217

Epipe ......................................................................................................................................................218

IES .........................................................................................................................................................218

VPLS ......................................................................................................................................................219

VPRN .....................................................................................................................................................219

Editing QoS Policies....................................................................................................................................220

Copying and Overwriting QoS Policies .......................................................................................................220

Deleting QoS Policies..................................................................................................................................221

Remove a Policy from the QoS Configuration.............................................................................................221

Service SAP QoS Policy Command Reference ...............................................................................................223

Command Hierarchies.................................................................................................................................223

Table of Contents

6 Quality of Service Guide

Service Ingress QoS Policy Commands ................................................................................................223

Service Egress QoS Policy Commands .................................................................................................227

Operational Commands .........................................................................................................................230

Show Commands...................................................................................................................................231

Command Descriptions ...............................................................................................................................231

Configuration Commands ......................................................................................................................231

Operational Commands .........................................................................................................................232

Show Commands...................................................................................................................................370

Queue Sharing and Redirection........................................................................................................ 389

In This Section..................................................................................................................................................389

Queue Sharing and Redirection .......................................................................................................................389

Supported Platforms....................................................................................................................................390

Queue Group Applications ..........................................................................................................................390

Access SAP Queue Group Applications .....................................................................................................390

Ingress Access Port Queue Group Hardware Queue Allocation.................................................................391

Network Port Queue Groups for IP Interfaces.............................................................................................392

Pseudowire Shaping for Layer 2 and Layer 3 Services ..............................................................................392

QoS on Ingress Bindings.............................................................................................................................393

Queue Group Templates and Port Queue Groups......................................................................................395

Queue Group Templates.............................................................................................................................395

Port Queue Groups .....................................................................................................................................396

Percent-Rate Support ............................................................................................................................396

Forwarding Plane Queue Groups................................................................................................................396

Redirection Models......................................................................................................................................397

Access SAP Forwarding Class Based Redirection .....................................................................................398

Ingress and Egress SAP Forwarding Class Redirection Association Rules ...............................................400

Policy Based Provisioning Model ...........................................................................................................400

SAP-Based Provisioning Model .............................................................................................................402

Access Queue Group Statistics...................................................................................................................404

Port Queue Groups ................................................................................................................................404

Forwarding Plane Queue Groups ..........................................................................................................404

Network IP Interface Forwarding Class-Based Redirection ........................................................................405

Egress Network Forwarding Class Redirection Association Rules .............................................................405

Egress Network IP Interface Statistics ........................................................................................................407

Separate Ingress IPv4 and IPv6 Statistics ..................................................................................................407

Ingress PW Shaping Using Spoke-SDP Forwarding Class-Based Redirection ..........................................407

Feature Configuration ............................................................................................................................408

Provisioning Model.................................................................................................................................409

Ingress Packet Classification .................................................................................................................411

Egress PW Shaping using Spoke-SDP Forwarding Class-Based Redirection ...........................................411

Feature Configuration ............................................................................................................................411

Provisioning Model.................................................................................................................................412

Egress Marking of PW Packet Header...................................................................................................414

Egress Packet Re-Classification Based on IPv4/IPv6 Criteria ...............................................................414

Ingress Per SAP Statistics with Ingress Queue Groups...........................................................................

...415

Ingress and Egress PW Statistics ...............................................................................................................417

Queue Group Behavior on LAG ..................................................................................................................418

Queue Group Queue Instantiation Per Link ................................................................................................418

Table of Contents

Quality of Service Guide 7

Per Link Queue Group Queue Parameters .................................................................................................418

Adding a Queue Group to an Existing LAG.................................................................................................418

Removing a Queue Group from a LAG .......................................................................................................418

Adding a Port to a LAG ...............................................................................................................................419

Basic Configurations.........................................................................................................................................419

Configuring an Ingress Queue Group Template .........................................................................................419

Configuring Egress Queue Group Template ...............................................................................................420

Applying Ingress Queue Group to SAP Ingress Policy ...............................................................................420

Applying Egress Queue Group to SAP Egress Policy.................................................................................421

SAP-based Egress Queue Re-direction .....................................................................................................422

Configuring Queue Group on Ethernet Access Ingress Port.......................................................................423

Configuring Overrides .................................................................................................................................424

Configuring Queue Group on Ethernet Access Egress Port .......................................................................425

Configuring Queue Group for Network Egress Traffic on Port ....................................................................426

Configuring Queue Group for Network Ingress Traffic on Forwarding Plane ..............................................427

Using Queue Groups to Police Ingress/Egress Traffic on Network Interface..............................................428

Configuring Ingress/Egress PW Shaping Using Spoke-SDP Forwarding Class-Based Redirection...........429

Specifying QoS Policies on Service SAPs ..................................................................................................432

QoS Queue Group Template Command Reference ........................................................................................433

Command Hierarchies.................................................................................................................................433

Configuring Egress Queue Group Templates ........................................................................................433

Configuring Ingress Queue Group Templates .......................................................................................434

Show Commands...................................................................................................................................436

Monitor Commands................................................................................................................................436

Command Descriptions ...............................................................................................................................437

Configuration Commands ......................................................................................................................437

Show Commands...................................................................................................................................466

Monitor Commands................................................................................................................................500

QoS Scheduler Policies ..................................................................................................................... 505

In This Section..................................................................................................................................................505

Overview ..........................................................................................................................................................505

Scheduler Policies.......................................................................................................................................505

Egress Port-Based Schedulers ...................................................................................................................506

Service/Subscriber or Multi-service Site Egress Port Bandwidth Allocation ..........................................508

Service or Subscriber or Multi-service site Scheduler Child to Port Scheduler Parent ..........................510

Frame and Packet-Based Bandwidth Allocation ....................................................................................513

Queue Parental Association Scope .......................................................................................................515

Service or Subscriber or Multi-service Site-Level Scheduler Parental Association Scope ....................516

Network Queue Parent Scheduler .........................................................................................................517

Foster Parent Behavior for Orphaned Queues and Schedulers ............................................................517

Congestion Monitoring on Egress Port Scheduler .................................................................................518

Frame-Based Accounting............................................................................................................................524

Operational Modifications.......................................................................................................................524

Existing Egress Port Based Virtual Scheduling......................................................................................525

Queue Behavior Modifications for Frame Based Accounting.................................................................525

Virtual Scheduler Rate and Queue Rate Parameter Interpretation ........................................................525

Virtual Scheduling Unused Bandwidth Distribution .....................................................................................526

Default Unused Bandwidth Distribution..................................................................................................526

Table of Contents

8 Quality of Service Guide

Limit Unused Bandwidth ........................................................................................................................527

Configuring Port Scheduler Policies............................................................................................................529

Port Scheduler Structure........................................................................................................................529

Special Orphan Queue and Scheduler Behavior ...................................................................................529

Packet to Frame Bandwidth Conversion................................................................................................530

Aggregate Rate Limits for Directly Attached Queues.............................................................................531

SAP Egress QoS Policy Queue Parenting.............................................................................................531

Network Queue QoS Policy Queue Parenting .......................................................................................532

Egress Port Scheduler Overrides...........................................................................................................532

Applying a Port Scheduler Policy to a Virtual Port .................................................................................532

Applying Aggregate Rate Limit to a VPORT ..........................................................................................534

Applying a Scheduler Policy to a VPORT ..............................................................................................534

Weighted Scheduler Group in a Port Scheduler Policy..........................................................................536

Basic Configurations ..................................................................................................................................536

Create a QoS Scheduler Policy .............................................................................................................537

Applying Scheduler Policies...................................................................................................................538

Creating a QoS Port Scheduler Policy ...................................................................................................542

Configuring Port Parent Parameters ...........................................................................................................543

Within-CIR Priority Level Parameters ....................................................................................................543

Above-CIR Priority Level Parameters ....................................................................................................544

Configuring Distributed LAG Rate ...............................................................................................................544

Service Management Tasks .............................................................................................................................556

Deleting QoS Policies..................................................................................................................................556

Removing a QoS Policy from a Customer Multi-Service Site.................................................................557

Removing a QoS Policy from SAP(s).....................................................................................................557

Removing a Policy from the QoS Configuration.....................................................................................558

Copying and Overwriting Scheduler Policies ..............................................................................................558

Editing QoS Policies....................................................................................................................................560

QoS Scheduler Policy Command Reference ...................................................................................................561

Command Hierarchies.................................................................................................................................561

Scheduler Policy Configuration Commands...........................................................................................561

Port Scheduler Policy Configuration Commands ...................................................................................561

Operational Commands .........................................................................................................................562

Show Commands..................................................................................................................

.................562

Clear Commands ...................................................................................................................................563

Command Descriptions ...............................................................................................................................564

Configuration Commands ......................................................................................................................564

Operational Commands .........................................................................................................................564

Scheduler Policy Commands .................................................................................................................565

Port Scheduler Policy Commands .........................................................................................................573

Show Commands...................................................................................................................................581

Clear Commands ...................................................................................................................................617

Slope QoS Policies............................................................................................................................. 621

In This Section..................................................................................................................................................621

Overview...........................................................................................................................................................621

Basic Configurations ...................................................................................................................................622

Create a Slope QoS Policy ....................................................................................................................622

Applying Slope Policies..........................................................................................................................623

Table of Contents

Quality of Service Guide 9

Default Slope Policy Values .......................................................................................................................625

Deleting QoS Policies..................................................................................................................................626

Ports.......................................................................................................................................................626

MDA (FP1) .............................................................................................................................................627

FP (FP2 and higher based hardware) ....................................................................................................627

Remove a Policy from the QoS Configuration .......................................................................................628

Copying and Overwriting QoS Policies .......................................................................................................628

Editing QoS Policies....................................................................................................................................629

Slope QoS Policy Command Reference ..........................................................................................................631

Command Hierarchies.................................................................................................................................631

Configuration Commands ......................................................................................................................631

Operational Commands .........................................................................................................................631

Show Commands...................................................................................................................................632

Command Descriptions ...............................................................................................................................632

Configuration Commands ......................................................................................................................632

Operational Commands .........................................................................................................................632

Show Commands...................................................................................................................................638

Shared-Queue QoS Policies .............................................................................................................. 641

In This Section..................................................................................................................................................641

Overview...........................................................................................................................................................641

Multipoint Shared Queuing..........................................................................................................................642

Ingress Queuing Modes of Operation ....................................................................................................642

Ingress Service Queuing........................................................................................................................642

Basic Configurations ...................................................................................................................................647

Modifying the Default Shared-Queue Policy ...............................................................................................648

Applying Shared-Queue Policies ...........................................................................................................648

Default Shared Queue Policy Values .........................................................................................................651

Shared-Queue QoS Policy Command Reference ............................................................................................657

Command Hierarchies.................................................................................................................................657

Configuration Commands ......................................................................................................................657

Show Commands...................................................................................................................................657

Command Descriptions ...............................................................................................................................658

Configuration Commands ......................................................................................................................658

Show Commands...................................................................................................................................667

Advanced QoS Policies ..................................................................................................................... 669

In This Section..................................................................................................................................................669

Overview...........................................................................................................................................................669

Basic Configurations ...................................................................................................................................670

Create an Advanced QoS Policy............................................................................................................670

Applying Advanced Policies ...................................................................................................................671

Default Advanced Policy Values ................................................................................................................672

Deleting QoS Policies..................................................................................................................................672

Queue Group .........................................................................................................................................672

SAP Ingress ...........................................................................................................................................673

SAP Egress............................................................................................................................................673

Copying and Overwriting Advanced Policies...............................................................................................673

Editing Advanced Policies ...........................................................................................................................673

Table of Contents

10 Quality of Service Guide

Advanced QoS Policy Command Reference....................................................................................................675

Command Hierarchies.................................................................................................................................675

Configuration Commands ......................................................................................................................675

Operational Commands .........................................................................................................................675

Show Commands...................................................................................................................................676

Command Descriptions ...............................................................................................................................676

Configuration Commands ......................................................................................................................676

Operational Commands .........................................................................................................................677

Show Commands...................................................................................................................................690

QoS ATM Traffic Descriptor Profiles ............................................................................................... 691

In This Section..................................................................................................................................................691

Overview...........................................................................................................................................................691

ATM Traffic Descriptor Profiles ...................................................................................................................691

ATM Traffic Management.......................................................................................................................691

QoS Model for ATM-Based Services .....................................................................................................692

ATM Service Categories ........................................................................................................................693

ATM Traffic Descriptors and QoS Parameters.......................................................................................693

Policing...................................................................................................................................................694

Shaping ..................................................................................................................................................694

ATM Queuing and Scheduling ...............................................................................................................694

Congestion Avoidance ...........................................................................................................................695

Basic Configurations ...................................................................................................................................695

Create an ATM-TD-Profile QoS Policy...................................................................................................695

Applying ATM-TD-Profile Policies ..........................................................................................................696

Default ATM-TD-Profile Policy Values .......................................................................................................698

Service Management Tasks .............................................................................................................................699

Removing a Profile from the QoS Configuration .........................................................................................699

Copying and Overwriting Profile ..................................................................................................................699

Editing QoS Policies....................................................................................................................................700

ATM QoS Policy Command Reference ............................................................................................................701

Command Hierarchies.................................................................................................................................701

Configuration Commands ......................................................................................................................701

Operational Commands .........................................................................................................................701

Show Commands ..................................................................................................................................701

Command Descriptions ...............................................................................................................................702

Configuration Commands ......................................................................................................................702

Named Pools....................................................................................................................................... 719

In This Section..................................................................................................................................................719

Overview...........................................................................................................................................................719

Named Pool Mode for IOM3-XP Card.........................................................................................................722

Basic Configuration .....................................................................................................................................723

Create a Named Pool QoS Policy..........................................................................................................723

Named pool Configuration Procedure ....................................................................................................723

Allocation Steps .....................................................................................................................................725

Named Pools QoS Policy Command Reference ..............................................................................................727

Command Hierarchies.................................................................................................................................727

Configuration Commands ......................................................................................................................727

Table of Contents

Quality of Service Guide 11

Show Commands...................................................................................................................................728

Command Descriptions ...............................................................................................................................728

Configuration Commands ......................................................................................................................728

Named Pool Policy Creation ..................................................................................................................729

Shared Queue QoS Commands ............................................................................................................743

Network Queue QoS Policy Commands ................................................................................................746

Show Commands...................................................................................................................................750

High Scale Ethernet MDA Capabilities ............................................................................................. 757

In This Section..................................................................................................................................................757

HSMDA QoS Model..........................................................................................................................................757

Queue Scaling.............................................................................................................................................758

Port-Based Scheduling................................................................................................................................758

Dual Pass Queuing .....................................................................................................................................762

Egress Intermediate Destination Secondary Shapers.................................................................................762

Packet and Octet Counting .........................................................................................................................764

Above CIR Discard with PIR Bypass...........................................................................................................766

HSMDA Ingress Queue Policing Mode ..................................................................................................766

HSMDA Buffer Utilization Controls..............................................................................................................768

HSMDA Buffer Pools..............................................................................................................................768

Identifying Queue Groups as Provisioned or System ............................................................................768

Provisioned and System Port Class Pools.............................................................................................769

Aggregate Pools for Type and Class Separation ...................................................................................770

Use of Aggregate Control Buffer Pools ..................................................................................................771

HSMDA Buffer Pool Policy .....................................................................................................................773

Port Class Pool Sizing............................................................................................................................775

HSMDA Available Buffer Register Operation.........................................................................................775

HSMDA Queue Congestion and Buffer Utilization Controls ........................................................................776

Maximum HSMDA Queue Depth ...........................................................................................................777

Control Plane HSMDA RED Slope Policy Management ........................................................................777

HSMDA Slope Policy MBS Parameter ...................................................................................................778

HSMDA Slope Policy Slope Parameters................................................................................................778

HSMDA Slope Shutdown Behavior........................................................................................................782

Ingress Packet Mapping to HSMDA RED Slope ....................................................................................782

Egress Packet Mapping to HSMDA RED Slope ....................................................................................782

HSMDA Queue Congestion or Pool Congestion Discard Stats .............................................................783

Egress Queue CIR Based Dot1P Remarking..............................................................................................784

SAP Ingress and SAP Egress QoS Policies.....................................................................................................784

SAP Ingress QoS Policy..............................................................................................................................784

SAP Egress QoS Policy ..............................................................................................................................785

Subscriber Queuing Differences.......................................................................................................................786

HSMDA Features .............................................................................................................................................786

HSMDA LAG ...............................................................................................................................................786

Billing...........................................................................................................................................................787

Resource Management ...............................................................................................................................787

HSMDA Queue Groups...............................................................................................................................788

Scheduling Classes.............................................................................................................

...................788

Scheduling Class Weighted Groups ......................................................................................................789

Scheduler Strict Priority Levels ..............................................................................................................789

Table of Contents

12 Quality of Service Guide

Strict Priority Level PIR ..........................................................................................................................789

Scheduler Maximum Rate ......................................................................................................................790

HSMDA Scheduler Policy Overrides ......................................................................................................790

Orphan Queues......................................................................................................................................790

Default HSMDA Scheduling Policy ........................................................................................................790

Basic HSMDA Configurations .....................................................................................................................791

HSMDA Pool Policies.............................................................................................................................791

HSMDA Scheduler Policies....................................................................................................................792

HSMDA Slope Policies...........................................................................................................................793

Egress Queue Group .............................................................................................................................793

Configuring HSMDA Queue Group Overrides .......................................................................................794

Applying HSMDA Policies ...........................................................................................................................794

HSMDA Command Reference .........................................................................................................................797

Command Hierarchies.................................................................................................................................797

Show Commands...................................................................................................................................798

Command Descriptions ...............................................................................................................................798

Configuration Commands ......................................................................................................................798

QoS in MC-MLPPP ............................................................................................................................. 829

In This Section..................................................................................................................................................829

Overview...........................................................................................................................................................829

Ingress MLPPP Class Reassembly.............................................................................................................833

Configuring MC-MLPPP QoS Parameters ..................................................................................................833

Basic Configurations.........................................................................................................................................834

Configuring MC-MLPPP ..............................................................................................................................836

QoS in MLFR and FRF.12 Fragmentation........................................................................................................836

QoS in MLFR...............................................................................................................................................836

QoS in FRF.12 End-to-End Fragmentation .................................................................................................839

MLPPP Command Reference ..........................................................................................................................841

Command Hierarchies.................................................................................................................................841

Configuration Commands ......................................................................................................................841

Command Descriptions ...............................................................................................................................842

Configuration Commands ......................................................................................................................842

Class Fair Hierarchical Policing (CFHP)........................................................................................... 847

In This Section..................................................................................................................................................847

Introduction.......................................................................................................................................................847

Parent Policer Priority and Unfair Sensitive Discard Thresholds......................................................................849

CFHP Ingress and Egress Use Cases .............................................................................................................851

Post-CFHP Queuing and Scheduling ...............................................................................................................851

Ingress CFHP Queuing ...............................................................................................................................851

Egress CFHP Queuing................................................................................................................................852

Policer to Local Queue Mapping ............................................................................................................852

Egress Subscriber CFHP Queuing..............................................................................................................853

Subscriber Destination String Queue Group Identification.....................................................................854

SAP Default Destination String ...................................................................................................................854

CFHP Policer Control Policy.............................................................................................................................855

Policer Control Policy Root Arbiter ..............................................................................................................855

Tier 1 and Tier 2 Explicit Arbiters ................................................................................................................856

Table of Contents

Quality of Service Guide 13

Explicit Arbiter Rate Limits ..........................................................................................................................856

CFHP with Child Policer Exceed PIR Enabled ...........................................................................................856

CFHP Child Policer Definition and Creation .....................................................................................................857

Policer Enabled SAP QoS Policy Applicability .................................................................................................858

Child Policer Parent Association ......................................................................................................................858

Profile Capped Policers ....................................................................................................................................859

Policer Interaction with Initial Profile, Discard Eligibility, and Ingress Priority...................................................861

Ingress ‘Undefined’ Initial Profile .................................................................................................................863

Ingress Explicitly ‘In-Profile’ State Packet Handling without Profile-Capped Mode.....................................863

Ingress Explicitly ‘In-Profile’ State Packet Handling with Profile-Capped Mode..........................................864

Ingress Explicit ‘Out-of-Profile’ State Packet Handling................................................................................864

Egress Explicit Profile Reclassification........................................................................................................864

Preserving Out of Profile State at Egress Policer........................................................................................865

Egress Policer CIR Packet Handling without Profile Capped Mode............................................................865

Egress Policer CIR Packet Handling with Profile Capped Mode.................................................................865

Forwarding Traffic Exceeding PIR in Egress Policers .................................................................................866

Ingress Child Policer Stat-Mode ..................................................................................................................866

Egress Child Policer Stat-Mode ..................................................................................................................869

Profile Preferred Mode Root Policers ...............................................................................................................870

Class Fair Hierarchical Policing (CFHP) Policy Command Reference .............................................................873

Command Hierarchies.................................................................................................................................873

Class Fair Hierarchical Policing Commands ..........................................................................................873

Command Descriptions ...............................................................................................................................874

Configuration Commands ......................................................................................................................874

Frequently Used QoS Terms ............................................................................................................ 887

In This Chapter .................................................................................................................................................887

Above CIR Distribution .....................................................................................................................................888

Available Bandwidth .........................................................................................................................................888

CBS ..................................................................................................................................................................888

CIR ...................................................................................................................................................................888

CIR Level..........................................................................................................................................................889

CIR Weight .......................................................................................................................................................889

Child .................................................................................................................................................................890

Level .................................................................................................................................................................890

MBS..................................................................................................................................................................890

MCR .................................................................................................................................................................890

Offered Load.....................................................................................................................................................891

Orphan..............................................................................................................................................................891

Parent ...............................................................................................................................................................891

Queue...............................................................................................................................................................892

Rate ..................................................................................................................................................................892

Root (Scheduler) ..............................................................................................................................................892

Scheduler Policy...............................................................................................................................................893

Tier ...................................................................................................................................................................893

Virtual Scheduler ..............................................................................................................................................893

Weight ..............................................................................................................................................................893

Within CIR Distribution .....................................................................................................................................894

Table of Contents

14 Quality of Service Guide

Standards and Protocol Support ...................................................................................................... 895

Quality of Service Guide 15

Getting Started

About This Guide

This guide describes the Quality of Service (QoS) provided by the routers and presents

examples to configure and implement various protocols and services.

This document is organized into functional chapters and provides concepts and descriptions

of the implementation flow, as well as Command Line Interface (CLI) syntax and command

usage.

Unless otherwise specified, the topics and commands described in this document apply to the:

• 7450 ESS

• 7750 SR

• 7950 XRS

7450 ESS applicability statements refer to the 7450 ESS when it is not running in mixed

mode. 7750 SR applicability statements refer to the 7750 SR-7/12, 7750 SR-12e, 7750 SR-

a4/a8 and 7750 SR-e1/e2/e3 platforms unless otherwise specified.

Command outputs shown in this guide are examples only; actual displays may differ

depending on supported functionality and user configuration.

Alcatel-Lucent SR-Series Router Services

Configuration Process

Table 1 lists the tasks necessary to configure and apply QoS policies. This guide is presented

in an overall logical configuration flow. Each section describes a software area and provides

CLI syntax and command usage to configure parameters for a functional area.

Alcatel-Lucent SR-Series Router Services Configuration Process

16 Quality of Service Guide

Table 1: Configuration Process

Area Task Chapter Supported

Platform

Policy configuration Configuring QoS Policies

Network Network QoS Policies All

Network queue Network Queue QoS Policies All

SAP ingress/SAP egress Service Egress and Ingress QoS

Policies

All

Scheduler QoS Scheduler Policies All

Slope Slope QoS Policies All

Shared queue Shared-Queue QoS Policies 7450 ESS,

7750 SR

ATM traffic descriptor QoS ATM Traffic Descriptor Profiles 7750 SR

Named pools Named Pools 7450 ESS,

7750 SR

HSMDA High Scale Ethernet MDA

Capabilities

7750 SR

CFHP Class Fair Hierarchical Policing

(CFHP)

7750 SR,

7950 XRS

Reference List of IEEE, IETF, and

other proprietary entities

Standards and Protocol Support All

Quality of Service Guide 17

QoS Policies

In This Chapter

This chapter provides information about Quality of Service (QoS) policy management.

Topics in this chapter include:

• QoS Overview

→ Forwarding Classes

→ Queue Parameters

• QoS Policies

→ Service versus Network QoS

→ QoS Policy Entities

→ Network QoS Policies

→ Network Queue QoS Policies

→ Service Ingress QoS Policies

→ Service Egress QoS Policies

→ Named Pool Policies

→ Slope Policies

→ Scheduler Policies

→ Shared Queues

→ ATM Traffic Descriptor Profiles

→ Configuration Notes

QoS Overview

Routers are designed with Quality of Service (QoS) mechanisms on both ingress and egress

to support multiple customers and multiple services per physical interface. The router has an

extensive and flexible capabilities to classify, police, shape and mark traffic.

QoS Overview

18 Quality of Service Guide

In the Alcatel-Lucent service router’s service model, a service is provisioned on the provider-

edge (PE) equipment. Service data is encapsulated and then sent in a service tunnel to the far-

end Alcatel-Lucent service router where the service data is delivered.

The operational theory of a service tunnel is that the encapsulation of the data between the

two Alcatel Lucent service routers (such as the 7950 XRS, 7750 SR, 7750 SR MG and

7450 ESS) appear like a Layer 2 path to the service data although it is really traversing an IP

or IP/MPLS core. The tunnel from one edge device to the other edge device is provisioned

with an encapsulation and the services are mapped to the tunnel that most appropriately

supports the service needs.

The router supports eight forwarding classes internally named: Network-Control, High-1,

Expedited, High-2, Low-1, Assured, Low-2 and Best-Effort. The forwarding classes are

discussed in more detail in Forwarding Classes.

Router QoS policies control how QoS is handled at distinct points in the service delivery

model within the device. There are different types of QoS policies that cater to the different

QoS needs at each point in the service delivery model. QoS policies are defined in a global

context in the router and only take effect when the policy is applied to a relevant entity.

QoS policies are uniquely identified with a policy ID number or name. Policy ID 1 or Policy

ID “default” is reserved for the default policy which is used if no policy is explicitly applied.

The QoS policies within the router can be divided into three main types:

• QoS policies are used for classification, defining and queuing attributes and marking.

• Slope policies define default buffer allocations and WRED slope definitions.

• Scheduler policies determine how queues are scheduled.

Forwarding Classes

Routers support multiple forwarding classes and class-based queuing, so the concept of

forwarding classes is common to all of the QoS policies.

Each forwarding class (also called Class of Service (CoS)) is important only in relation to the

other forwarding classes. A forwarding class provides network elements a method to weigh

the relative importance of one packet over another in a different forwarding class.

Queues are created for a specific forwarding class to determine the manner in which the queue

output is scheduled into the switch fabric. The forwarding class of the packet, along with the

profile state, determines how the packet is queued and handled (the per hop behavior (PHB))

at each hop along its path to a destination egress point. Routers support eight (8) forwarding

classes (Table 2).

QoS Policies

Quality of Service Guide 19

Table 2 presents the default definitions for the forwarding classes. The forwarding class

behavior, in terms of ingress marking interpretation and egress marking, can be changed by

a Network QoS Policies. All forwarding class queues support the concept of in-profile and

out-of-profile, and exceed-profile at egress.

The forwarding classes can be classified into three class types:

• High priority/Premium

• Assured

•Best effort

High Priority Classes

The high priority forwarding classes are Network Control (nc), Expedited (ef), High 1 (h1),

and High 2 (h2). High priority forwarding classes are always serviced at congestion points

over other forwarding classes; this behavior is determined by the router queue scheduling

algorithm (Virtual Hierarchical Scheduling).

Table 2: Forwarding Classes

FC-ID FC Name FC

Designatio

n

DiffServ

Name

Class Type Notes

7Network

Control

NC NC2 High-Priority Intended for network control traffic

6 High-1 H1 NC1 Intended for a second network control

class or delay/jitter sensitive traffic

5 Expedited EF EF Intended for delay/jitter sensitive traffic

4 High-2 H2 AF4 Intended for delay/jitter sensitive traffic

3 Low-1 L1 AF2 Assured Intended for assured traffic. Also is the

default priority for network management

traffic

2 Assured AF AF1 Intended for assured traffic

1 Low-2 L2 CS1 Best Effort Intended for BE traffic

0 Best Effort BE BE

QoS Overview

20 Quality of Service Guide

With a strict PHB at each network hop, service latency is mainly affected by the amount of

high-priority traffic at each hop. These classes are intended to be used for network control

traffic or for delay or jitter-sensitive services.

If the service core network is over-subscribed, a mechanism to traffic engineer a path through

the core network and reserve bandwidth must be used to apply strict control over the delay

and bandwidth requirements of high-priority traffic. In the router, RSVP-TE can be used to

create a path defined by an MPLS LSP through the core. Premium services are then mapped

to the LSP with care exercised to not oversubscribe the reserved bandwidth.

If the core network has sufficient bandwidth, it is possible to effectively support the delay and

jitter characteristics of high-priority traffic without utilizing traffic engineered paths, as long

as the core treats high-priority traffic with the proper PHB.

Assured Classes

The assured forwarding classes are Assured (af) and Low 1 (l1). Assured forwarding classes

provide services with a committed rate and a peak rate much like Frame Relay. Packets

transmitted through the queue at or below the committed transmission rate are marked in-

profile. If the core service network has sufficient bandwidth along the path for the assured

traffic, all aggregate in-profile service packets will reach the service destination. Packets

transmitted out the service queue that are above the committed rate will be marked out-of-

profile or exceed-profile (if exceeding the PIR is enabled). When an assured out-of-profile or

exceed-profile service packet is received at a congestion point in the network, it will be

discarded before in-profile assured service packets.

Multiple assured classes are supported with relative weighting between them. In DiffServ, the

code points for the various Assured classes are AF4, AF3, AF2 and AF1. Typically, AF4 has

the highest weight of the four and AF1 the lowest. The Assured and Low 1 classes are

differentiated based on the default DSCP mappings. All DSCP and EXP mappings can be

modified by the user.

Best-Effort Classes

The best-effort classes are Low 2 (l2) and Best-Effort (be). The best-effort forwarding classes

have no delivery guarantees. All packets within this class are treated by default as out-of-

profile assured service packets.

Page is loading ...

Alcatel-Lucent 7750, 7450, 7950 Quality Of Service Manual

Related papers

Other documents